Current-supply device



Aug'. 26, 1930. 1 w` Frrz GERALD V`l,774,261

URRENT SUPPLY DEVICE yFiled Oct. 27, 1926 @Wadi/Uf, John \}J F1tzqmld y. www y Patented Aug.`26, 1930 'Y jPATENr f' O'l-rlcllg JOHN W. Irrz GERALD, OF sn'OItnWOOD, WISCONSIN, AssIGNOR To BRIGGS & STRAT'ION CoRronA'rIoN, OF MILWAUKEE, lWISCONSIN, Ay CORPORATION OF WISCONSIN CURRENT-SUPPLY "nnvrcn Application flied October y27, ieee.Av ser-mirc. 144,409'.

l'This invention relates to new ,and useful provision of an improved andsimplied battery eliminator and circuit arrangement thereforrvvherein .current-for the radio receiver is obtained directly from theiservlce lines throu-gh a current adapting means con'-v ynectedwith the radio receiverby'suitable con-v ductors acrossvvhich' is floated an electrolytic cell having electro-chemical energy storing characteristics in lthe -circuit of Which is-incorporated means for ironing orsmoothing out the current impulsesywhereby current sup` plied the receiver `from the service line is in a substantiallystraight line to thus eliminate the reproduction of -a humor other audible noise. f It 1s acharacterlsticoita condenser used Witlra rectifier wherein current is directedy into Vthe electrolytic cell during the one-halfy of-the vv-ave period only andi-s exhausted therefrom .duringthe othervhalf thatduring the charging period, vthe electrolytic cell voltage increases and likewise during `the other half periodits voltage decreases, consequently, the current furnished to thereceiver f increases' fand decreases thus causing an4 audi-ble ,noise or` hum in the receiver, yand l this invention has as another Objectthe eliminatin-g of this variation in the .current and, consequently, the elimination 'ofthe yresult-ing hum .in theradio receiverfrb'y the4 imposition of a choke, coill infv the. circuitbe-tween the electrolytic cellandreceivenV y It is also a `characteristic of a choke coil to tend to hold back or chokefsudden increases in current due to an, increase in; voltage and.

to hold'back kor retardf'a decrease in current due to a sudden drop in voltage, andthis invention ycontemplates thecprovision of means y'for further .assisting "the choking action of the ,l Coil by the inductance or generation of an additional .current to tend ftol hol-d the value for sup plying the radio receiver, I

'more' sjgiecic Vobject yof this invention resides in theprovision Vof a battery eliminator of thecharactervdescribed rhaving an ,improved choke coil includedL in the'receiver circuit ,between the electrolytic celland the receiver and c having windings` supplied with" Vcurrent of different characteristics. l,

.With the above and other objectsin view Which Willgappear as the description Vprostruction,l combination and arrangementof `'parts substantially as .hereinafter described and Amore particularly defined, by the ap'- pended claims, itbeing understood that such changes in the "precise embodiment 'of .the hereindisclosed "invention may be; made as come Within the scope ofthe claims. In the accompanying1 drawing, I# have lillustrated one cornp letef v example ofthe 'To physical embodiment of my invention constructed according to the best mode I have so far devised for the'practical application of the principles thereofr` and invvvhich: f

fThe single viewis a diagrammatic illusf tration of the'apparatus and circuit ,embodying my linvent-ion.

ceeds, my invention resides in the novel con- 10 The circuit illustra-ted the accoinpany-V .I

ing drawing is adapted tobe used in conn ection With alternating current and the numerals 5 and `6 designatealternating ,current service lines such as the '11C-volt circuitlordinarily used for lighting, purposes inresidences, and are connected, as yat' and 8, With the movable contacts 9 and, 10, respectively,

of arelaylladapted yto be operated to en lgagestationary; contacts 12 -andf13,:respec l tively, upon energizationof vacore 14 ,ofa"

choke coil 15.,.to be laterjdescribed.n The stationarycontacts 12 and 13 are Velectrically ,-90

'transrormerlflv by conductors 18 and 19,1e-v spectively, and inductively vassociated, with Connected with the primary Winding 16 of ya 16 is a secondary Winde VWith the secondarywinding-at an inter-me- ,109., diate point 25 by a conductor 26. The lother` f end 27 ofthe secondary winding is connected with the positive side of the filament circuit 28 of a radio receiver, diagraminatically illustrated as 29, by a conductor 30, the negative side 31 of the receiver filament circuit being connected with one side 32 of afilainent switch-33 the other side 34 of which is connected with the plate V35 of the rectitying bulb through a conductor 36, a winding 37 wound about the armature 14 of the choke coil 15, and a conductor 38.

Floatedpacross the conductors 30 and 38 is an electrolytic cell 39 having electro-chemiy cal energy storing characteristics so that, as-

suming that the relay 11 is closed, the current `flowing through the primary winding 16 induces or generates in the lsecondary winding 20..a current of the proper value to light the filament 22 and generate the arc necessary to rectify the current. 'The rectified current fiows Vthrough the choke coil winding 37, through the filament circuit of the receiver and back through theconductor 30. Assuming, for the purpose of illustration, the receiver demands two amperes, and the rectifier .Y passes four amperes during itscharging peft'o'theradio receiver is in a series of pulsations. The choke winding 37, however, ,tends to iron or smooth yout theimpulses and, if

desired, means may be provided ,to 4assist the winding 37 to further wipe out irregularities remaining inthe circuit so that the current flowingto theradio receiver has a .sub-

Vstantially constant value.

In` Figure 1,1 have illustrated one manner y of overcoming the iiuctuationsin the value of the lcurrent, which is in the form of a winding r wound aroundvthe core 14 and preferably of light wire and of proportionally many more turns than the winding 37 so thatfits current requirement is considerably under that of the heavy winding 37. The winding 40 is connectible with a source ofenergyand infthe embodiment illustrated,

one end 'of the winding 40 is connected across the terminals of the transformer secondary .winding 2O and has a variable resistor l1 incorporated in Vits circuit toY control the Yamount of current furnished to the wind- 'ing 40. (0,0

The current in the windingflO is of such value that as the current increases in the winding 37 the current likewise increases in the winding VL10 and endeavors to induce ory generate a currentin oppositionto the current in the winding Y andof avalue sufficient to pull the current therein down to a constant value. Likewise, when the current flowing through the winding 37 decreases, the current in the winding 40 tends to induce a current in the winding 37 having the characteristic of raising or increasing the current therein and thereby maintaining a substantially constant current value. Thus it will be seen that the light winding 40 further stabilizes the value of the current supplied the radio receiver and prevents the reproduction of a hum or other noise in the receiver.

With the construction illustrated, the conductors 5 and 6 are in constant electrical connection with the alternating current service line, not shown, and closing of the radio receiver filament circuit switch 33 connects the winding 37 across the electrolytic cell, energizing the winding which inagnetizes core 14. Immediately upon the magnetizing V of the core 111, relay 11 closes to engage the movable contacts 9 and 10 with the stationary contacts 12 and 13, respectively, connecting the primary winding of the transformer vwith the service line to set the device in operation. y

Likewise, when the switch 33 is open, the continuity of the circuit of the winding 37 is interrupted and, as a result, the relay 11 opens the service line circ-uit rendering the entire device inoperative.

Whatl claim as my invention is: 1. In 'a device for supplying radio receivers with electricalenergy from a source of alternating current and including means for rectifying the alternating current, conductors through which the rectified current is supplied the radio receiver and a cell having` electro-'chemical energy storing characteristics floated across the conductors, the current delivered the receiver tending to flow in pulsating waves having` the characteristic of producing an audible hum in the receiver it not eliminated, achoke coil including windings.. one connected within one conducandthe other shuntedabout the secondary ot the transformer, whereby pulsations inL the Vcurrent supplied the receiver are ironed out. l

2. In ay device for supplying radio receivers with electrical energy from a source ot alternating current and including means for rectifying the alternating current, conductors through which the rectified current is supplied the radio receiver and an electrolytic cell floated across the conductors, the current delivered to the receiver tending to flow in pulsating waves having the characteristic of producing an audible yhum in the receiver if not eliminated, and a choke coil including windings supplied with current of 'different characteristics, whereby pulsations in the current supplied the receiver are ironed out.

3. In a device for Supplying radio receivers with operating energy from a service line and vincluding means for reducing the voltage oi the energy from the service line to a predetermined degree, conductors through which current from said means is supplied to the radio receiver, an electrolytic cell floated across the conductors, a core, a winding on the core and connected 1n one of the conductors, a second winding on the core of light y 'l rectifying the alternating rcurrent and conductors through which the rectified current is supplied the radio receiver, a cell having electro-chemical energy storing characteristics floated across the conductors, a choke coil including windings, one connected within one conductor vand the other shunted, about the secondary of the transformer, and means for controlling the 'current supplied one winding.`

5. Ina device for supplying radio receiv` ers with operating energy from a service line and including means for reducing the voltf age of theenergy from theservice line toy a predetermined degree, conductors through which current from said means is supplied to the radio receiver, an electrolytic cell floated across the conductors, a winding connected in one of the conductors', a second winding, means connectlngthe' second winding ,with a source of current, other than that supplied.y

' the first coil whereby the current supplied the windings has different characteristics, and means for controlling the current supplied one winding.

6. In a device for supplying radio receivl ers with operating energy from a service line' andkincluding a transformer for' reducing the voltage of the energy from the service line to a predetermined degree, conductors v through which current from -said means is ysupplied to the radio receiver, an electrolytic cell floated across the conductors, a core, a

winding on the core and connected in one of the conductors, a second winding on the core of light wire and of proportionately many more turns than the first winding, means shunting the light winding about the secondary of transformer, and an adjustable control in the circuit of the second winding.v

In testimony whereof I hereunto ai'lix my signature.

JOHN w. FITZ GERALD'. 

